Shortcomings on SC 4's CAS and what I hope could be addressed.
1. Not enough face types for males and females.
2. Hair colour is stuck to one colour. (No two colours in one hairstyle)
3. Not enough Hair Types to choose from.
4. Some equipment dont fit exactly as they are supposed to (e.g. Cloaks dont look attached to neck, Necklaces are hidden behind clothing) and don't look "right".
5. Not being able to use/purchase existing characters' armor/equipment (e.g. Siegfried's Crystal Armor, Mitsurugi's Samurai outfit)
6. More styles to pick from, like in SC 3 which boasted original styles, and weapons arent "constrained" to that character's style (e.g. in SC 4, Cervantes weapons were a longsword and a pistol sword if im not mistaken - and you were stuck to those. Shura had two katanas, so why cant we use them too?). Allow more freedom in this aspect.
7. Not being able to use guest characters' styles. Im certain lots of people wanted to wield lightsabers in Soul Calibur 4, for instance. The bonus characters used existing styles so those are not counted. Hopefully, Soul Calibur 5 will be the first game to let us do so.
8. Minor, but could be appreciated - the ability to capture a portrait of your custom character so you could see him/her when selecting characters from character selection. Unlike in SC 4 where your custom character icons were represented by a random male and female side by side. Broken Destiny had this feature.
9. Lack of variation of voices to pick from. And yes, some of them sound...funny.
10. CAS should be able to use accessories like existing characters.
11. Remove the irritating "conflicting equipment" status for some equipment. It would make sense.
For example, your CAS wears a Monk's Garb with a Usurper's Suit as base equipment. Looks totally odd - like a samurai without proper pants.
Why can't you wear Samurai Hakama as lower body equipment, I wonder?